Analyzer error on package with invalid(?) URLs

[sveetch]

Using this tools with requirements including django-cotton will fail because of some error when resolving packages urls:

$ .venv/bin/dependency_comb report requirements/base.txt
00:57:21 - Processing package: django-cotton
Traceback (most recent call last):
  File "/home/Projects/foo/.venv/bin/dependency_comb", line 7, in <module>
    sys.exit(cli_frontend())
  File "/home/Projects/foo/.venv/lib/python3.10/site-packages/click/core.py", line 1462, in __call__
    return self.main(*args, **kwargs)
  File "/home/Projects/foo/.venv/lib/python3.10/site-packages/click/core.py", line 1383, in main
    rv = self.invoke(ctx)
  File "/home/Projects/foo/.venv/lib/python3.10/site-packages/click/core.py", line 1850, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/Projects/foo/.venv/lib/python3.10/site-packages/click/core.py", line 1246, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/Projects/foo/.venv/lib/python3.10/site-packages/click/core.py", line 814, in invoke
    return callback(*args, **kwargs)
  File "/home/Projects/foo/.venv/lib/python3.10/site-packages/click/decorators.py", line 34, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/home/Projects/foo/.venv/lib/python3.10/site-packages/dependency_comb/cli/report.py", line 182, in report_command
    payload = [pkg.data() for pkg in packages]
  File "/home/Projects/foo/.venv/lib/python3.10/site-packages/dependency_comb/cli/report.py", line 182, in <listcomp>
    payload = [pkg.data() for pkg in packages]
  File "/home/Projects/foo/.venv/lib/python3.10/site-packages/dependency_comb/analyzer.py", line 469, in inspect
    pkginfos = self.build_package_informations(item)
  File "/home/Projects/foo/.venv/lib/python3.10/site-packages/dependency_comb/analyzer.py", line 401, in build_package_informations
    urls = self.get_package_urls(data)
  File "/home/Projects/foo/.venv/lib/python3.10/site-packages/dependency_comb/analyzer.py", line 378, in get_package_urls
    for name, value in urls.items():
AttributeError: 'NoneType' object has no attribute 'items'